Postfix

Postfix is a very popular open source Mail Transfer Agent (MTA).

Steps for Ubuntu Ubuntu 14.04 LTS

• apt-get update / apt-get install mailutils
• apt-get install postfix
• Choose ok, Internet Site
• System mail name: bitarus.allowed.org
• nano /etc/postfix/main.cf

mydomain=bitarus.allowed.org
myhostname = mail.bitarus.allowed.org
smtpd_recipient_restrictions=permit_sasl_authenticated , reject_unauth_destination
relay_domains=
smtpd_sasl_auth_enable=yes
smtpd_sasl_security_options=noanonymous
smtpd_sasl_local_domain=$myhostname
broken_sasl_auth_clients=yes
smtpd_relay_restrictions=permit_sasl_authenticated
home_mailbox=Mailbox
mail_spool_directory=/var/mail

• service --status-all
• service postfix restart

User mail spool

• touch /var/mail/userx
• chown vitor:mail /var/mail/userx
• chmod o-r /var/mail/userx
• chmod g+rw /var/mail/userx

SASL

• apt-get install libsasl2-2 sasl2-bin libsasl2-modules
• nano /etc/default/saslauthd # change START=yes

START=yes
PWDIR="/var/spool/postfix/var/run/saslauthd"
PARAMS="-m ${PWDIR}"
PIDFILE="${PWDIR}/saslauthd.pid"
DESC="SASL Authentication Daemon"
NAME="saslauthd"
MECHANISMS="shadow"
THREADS=5
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd"

• dpkg-statoverride --force --update --add root sasl 755 /var/spool/postfix/var/run/saslauthd
• service saslauthd start

== Test starttls =

• openssl s_client -connect 127.0.0.1:25 -starttls smtp